问题 选择题

下列食物链正确的是(  )

A.草→牛→狮子

B.草←蚱蜢←食虫鸟

C.狐→蚱蜢→草

D.蚱蜢←草←食虫鸟

答案

食物链反映的是生产者与消费者之间吃与被吃这种关系的,所以食物链中不应该出现分解者.食物链的正确写法是:生产者→初级消费者→次级消费者…注意起始点是生产者.

A、该食物链正确的表示了生产者植物与消费者牛、狮子之间的关系,故符合题意;

B、把食物链的箭头的方向弄反了,正确的是草→蚱蜢→食虫鸟,故不符合题意;

C、狐是动物属于消费者,而食物链的起点必须是生产者,故不符合题意;

D、食虫鸟吃昆虫,不吃草,蚱蜢是动物属于消费者,而食物链的起点必须是生产者,故不符合题意;

故选A

单项选择题
单项选择题

Beyond question, Clinton was supposed to close up, stay out of sight, and avoid second- guessing his wife’s boss. After his ego blustered into oncoming traffic during Hillary’s heated primary race (1) Obama, the nation suffered from yet another turn of Clinton fatigue.

(2) this week Bill Clinton showed an instinct for robust, inclusive leadership that the (3) White House occupant could make good use of right for the time being. With President Obama struggling to (4) the political damage from the Gulf oil spill, Clinton not only can’t help himself—he’s worth being listened.

The conventional-wisdom (5) on President Obama’s early reaction to the spill was (6) he didn’t emote enough. He didn’t feel the (7) of all those people in the crisis whose livelihood would be destroyed, whose clean waters and wildlife would be (8) in black gunk.

Clinton considers this is an unfair (9) but offers a different—and more pointed— lesson to his young successor. "I think we ought to (10) in the same boat for a while... Let’s just (11) the problem, and then we can hold everybody responsible and emote or not emote, " Clinton conversed (12) CNN Anchor Wolf Blitzer.

Obama’s first (13) after the oil spill was to "feel the blame" rather than "feel the pain, " which are pretty sarcastic words as it were. No one intends to let British Petroleum (BP) management (14) the hook—for dangerously cutting corners, and for a (15) safety record. However, the President’s (16) focus on scolding BP consumed (17) White House energy while the oil gushed.

Great leaders don’t rush to criticise; Instead they instinctively (18) solutions. Rudy Giuliani, who didn’t stop to blame (19) intelligence for letting it happen, stood out from New York mayor with a girlfriend problem to 9/11 hero when he took control of a crisis and instilled confidence that a ravaged city could (20) beyond a terrorist attack.

8()

A.driven

B.shunned

C.drowned

D.killed